I apologize if this question has been asked and answered before, I wasn't able to find clear instructions on how to do this programmatically, though. I know that many modules return their identification, software version, workshop code and coding info as a response after receiving 1A 9B kwp request. Is there any info on the structure of this response? I was able to clearly see ascii strings with part numbers and software versions and numbers which correspond to coding info obtained by other methods, but I don't know how to decode this response in a general way. Similarly, I'm not exactly sure how to construct write request when trying to update coding info and write it back.

Could you please let me know where to find this document?

If someone reading this, and still dont know how to figure it out: have a look at the FR of MED9.1 , at page 4338. There is a description of all services.